package string;
/**
 * String和StringBuilder的性能测试:
 * 1.String是不变对象，因此不适合频繁修改内容，开销大、性能差
 */
public class StringAppendDemo {
    public static void main(String[] args) {
        String str ="字符串拼接";

        StringBuilder sb = new StringBuilder(str);
        for (int i = 0; i < 1000000; i++) {
            //str +="a";
            sb.append("a");
        }
        System.out.println("执行完毕");
    }
}
